Annotations: 4G80

Crystal structure of voltage sensing domain of Ci-VSP with fragment antibody (WT, 3.8 A)

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Membrane Protein Annotation: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: MemProtMD
Membrane Protein Annotation: mpstruc

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
J [auth H]	Med18	e4g80H1	A: beta barrels	X: DEATH domain	H: 40S ribosomal protein S13 N-terminal domain	T: 40S ribosomal protein S13 N-terminal domain	F: Med18	ECOD (v294.2)
H [auth F]	Med18	e4g80F1	A: beta barrels	X: DEATH domain	H: 40S ribosomal protein S13 N-terminal domain	T: 40S ribosomal protein S13 N-terminal domain	F: Med18	ECOD (v294.2)
E [auth D]	Med18	e4g80D1	A: beta barrels	X: DEATH domain	H: 40S ribosomal protein S13 N-terminal domain	T: 40S ribosomal protein S13 N-terminal domain	F: Med18	ECOD (v294.2)
C [auth B]	Med18	e4g80B1	A: beta barrels	X: DEATH domain	H: 40S ribosomal protein S13 N-terminal domain	T: 40S ribosomal protein S13 N-terminal domain	F: Med18	ECOD (v294.2)
I [auth G]	Med18	e4g80G1	A: beta barrels	X: DEATH domain	H: 40S ribosomal protein S13 N-terminal domain	T: 40S ribosomal protein S13 N-terminal domain	F: Med18	ECOD (v294.2)
G [auth E]	Med18	e4g80E1	A: beta barrels	X: DEATH domain	H: 40S ribosomal protein S13 N-terminal domain	T: 40S ribosomal protein S13 N-terminal domain	F: Med18	ECOD (v294.2)
D [auth C]	Med18	e4g80C1	A: beta barrels	X: DEATH domain	H: 40S ribosomal protein S13 N-terminal domain	T: 40S ribosomal protein S13 N-terminal domain	F: Med18	ECOD (v294.2)
B [auth A]	Acylphosphatase	e4g80A1	A: beta barrels	X: FAD-linked reductases, C-terminal domain-like	H: FAD-linked reductases-C	T: FAD-linked reductases-C	F: Acylphosphatase	ECOD (v294.2)
L [auth J]	AAA_23	e4g80J1	A: beta barrels	X: DEATH domain	H: HTH	T: winged helix domain	F: AAA_23	ECOD (v294.2)
K [auth I]	Med18	e4g80I1	A: beta barrels	X: DEATH domain	H: 40S ribosomal protein S13 N-terminal domain	T: 40S ribosomal protein S13 N-terminal domain	F: Med18	ECOD (v294.2)
F [auth T]	Acylphosphatase	e4g80T1	A: beta barrels	X: FAD-linked reductases, C-terminal domain-like	H: FAD-linked reductases-C	T: FAD-linked reductases-C	F: Acylphosphatase	ECOD (v294.2)
A [auth S]	Ribosomal_S4e	e4g80S1	A: beta barrels	X: jelly-roll	H: Galactose-binding domain-like	T: Galactose-binding domain-like	F: Ribosomal_S4e	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
J [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
H [auth F]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
E [auth D]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C [auth B]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
I [auth G]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
G [auth E]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D [auth C]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B [auth A]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F [auth T]	1.20.120.350	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Voltage-gated potassium channels. Chain C	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
C [auth B], E [auth D], H [auth F], J [auth H]	FRAGMENT ANTIBODY	L-KAPPA	Homo sapiens (human)	IGKV1D-1301, IGKV1-3901, IGKV1D-3901, IGKJ101, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202617-0)
B [auth A], D [auth C], G [auth E], I [auth G]	FRAGMENT ANTIBODY	VH-CH1	Homo sapiens (human)	IGHV3-6601, IGHV3-6602, IGHV3-6604, IGHJ201, IGHG101, IGHG102, IGHG1*04	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202617-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth B], E [auth D], H [auth F], J [auth H]	Light Chain	IGKV1	Kappa	voltage-sensor containing phosphatase	SAbDab (2026-05-08)
B [auth A], D [auth C], G [auth E], I [auth G]	Heavy Chain	IGHV3	-	voltage-sensor containing phosphatase	SAbDab (2026-05-08)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth S], F [auth T], K [auth I], L [auth J]	PF00520	Ion transport protein (Ion_trans)	Ion transport protein	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth B], E [auth D], H [auth F], J [auth H]	fragment antibody light chain	-	-	-
B [auth A], D [auth C], G [auth E], I [auth G]	fragment antibody heavy chain	-	-	-
A [auth S], F [auth T], K [auth I], L [auth J]	Voltage-sensor containing phosphatase	phosphoric ester hydrolase activity hydrolase activity, acting on ester bonds phosphatase activity phosphatidylinositol trisphosphate phosphatase activity hydrolase activity phosphatidylinositol-3,4,5-trisphosphate 3-phosphatase activity phosphatidylinositol phosphate phosphatase activity catalytic activity passive transmembrane transporter activity monoatomic ion channel activity channel activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity	-	cellular anatomical structure membrane intracellular anatomical structure cytoplasm cytosol

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth S], F [auth T], K [auth I], L [auth J]	IPR005821	Ion transport domain	Domain
A [auth S], F [auth T], K [auth I], L [auth J]	IPR045102	TPTE, protein tyrosine phosphatase-like catalytic domain	Domain
A [auth S], F [auth T], K [auth I], L [auth J]	IPR029021	Protein-tyrosine phosphatase-like	Homologous Superfamily
A [auth S], F [auth T], K [auth I], L [auth J]	IPR000387	Tyrosine-specific protein phosphatases domain	Domain
A [auth S], F [auth T], K [auth I], L [auth J]	IPR035892	C2 domain superfamily	Homologous Superfamily
A [auth S], F [auth T], K [auth I], L [auth J]	IPR029023	Tensin-type phosphatase domain	Domain
A [auth S], F [auth T], K [auth I], L [auth J]	IPR014020	Tensin phosphatase, C2 domain	Domain
A [auth S], F [auth T], K [auth I], L [auth J]	IPR016130	Protein-tyrosine phosphatase, active site	Active Site
A [auth S], F [auth T], K [auth I], L [auth J]	IPR051281	Dual-specificity lipid and protein phosphatase	Family
A [auth S], F [auth T], K [auth I], L [auth J]	IPR027359	Voltage-dependent channel domain superfamily	Homologous Superfamily

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A [auth S], F [auth T], K [auth I], L [auth J]	OPM	Transmembrane	Alpha-helical polytopic	Ion channel (VIC) superfamily	Voltage-sensing proton channel

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A [auth S], F [auth T], K [auth I], L [auth J]	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A [auth S], F [auth T], K [auth I], L [auth J]	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A [auth S], F [auth T], K [auth I], L [auth J]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Potassium, Sodium, & Proton Ion-Selective	Voltage-sensing domain of a voltage-sensitive phosphatase (R217E mutant)

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.